Re-indent code and reduce code being complied on Solaris for anetKeepAlive (#12914)
This is a follow-up PR for #12782, in which we introduced nested preprocessor directives for TCP keep-alive on Solaris and added redundant indentation for code. Besides, it could result in unreachable code due to the lack of `#else` on the latest Solaris 11.4 where `TCP_KEEPIDLE`, `TCP_KEEPINTVL`, and `TCP_KEEPCNT` are available. As a result, this PR does three main things: - To eliminate the redundant indention for C code in nested preprocessor directives - To add `#else` directives and move `TCP_KEEPALIVE_THRESHOLD` + `TCP_KEEPALIVE_ABORT_THRESHOLD` settings under it, avoid unreachable code and compiler warnings when `#if defined(TCP_KEEPIDLE) && defined(TCP_KEEPINTVL) && defined(TCP_KEEPCNT)` is met on Solaris 11.4 - To remove a few trailing whitespace in comments
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